Business Segments - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Real estate rental operations:
Revenue	$ 53,220		$ 58,141		$ 110,163	$ 117,891
Income from real estate	39,459		44,207		82,213	88,808
Interest expense, net and amortization of deferred debt costs	(12,019)		(10,793)		(21,613)	(21,860)
Depreciation and amortization of deferred leasing costs	(12,600)		(11,524)		(23,881)	(23,167)
General and administrative	(4,632)		(5,140)		(9,682)	(9,954)
Net Income	10,208	$ 16,829	16,750	$ 17,077	27,037	33,827
Capital investment	17,339		45,176		38,927	68,599
Total assets	1,686,636		1,569,162		1,686,636	1,569,162	$ 1,618,340
Operating Segments | Shopping Centers
Real estate rental operations:
Revenue	38,329		42,259		79,900	85,417
Income from real estate	29,965		33,707		62,614	67,177
Interest expense, net and amortization of deferred debt costs	0		0		0	0
Depreciation and amortization of deferred leasing costs	(7,258)		(7,375)		(14,644)	(14,657)
General and administrative	0		0		0	0
Net Income	22,707		26,332		47,970	52,520
Capital investment	4,687		8,967		8,889	13,580
Total assets	977,654		970,028		977,654	970,028
Operating Segments | Mixed-Use Properties
Real estate rental operations:
Revenue	14,891		15,882		30,263	32,474
Income from real estate	9,494		10,500		19,599	21,631
Interest expense, net and amortization of deferred debt costs	0		0		0	0
Depreciation and amortization of deferred leasing costs	(5,342)		(4,149)		(9,237)	(8,510)
General and administrative	0		0		0	0
Net Income	4,152		6,351		10,362	13,121
Capital investment	12,652		36,209		30,038	55,019
Total assets	642,621		590,294		642,621	590,294
Corporate and Other
Real estate rental operations:
Revenue	0		0		0	0
Income from real estate	0		0		0	0
Interest expense, net and amortization of deferred debt costs	(12,019)		(10,793)		(21,613)	(21,860)
Depreciation and amortization of deferred leasing costs	0		0		0	0
General and administrative	(4,632)		(5,140)		(9,682)	(9,954)
Net Income	(16,651)		(15,933)		(31,295)	(31,814)
Capital investment	0		0		0	0
Total assets	66,361		8,840		66,361	8,840
Real Estate
Real estate rental operations:
Expenses	(13,761)		(13,934)		(27,950)	(29,083)
Real Estate | Operating Segments | Shopping Centers
Real estate rental operations:
Expenses	(8,364)		(8,552)		(17,286)	(18,240)
Real Estate | Operating Segments | Mixed-Use Properties
Real estate rental operations:
Expenses	(5,397)		(5,382)		(10,664)	(10,843)
Real Estate | Corporate and Other
Real estate rental operations:
Expenses	$ 0		$ 0		$ 0	$ 0